Email deliverability fundamentals for B2B

Never send outbound from your primary domain

Cold outbound activity on your main corporate domain risks the email reputation that your fee earners depend on for client communication. Spin up dedicated sending domains (variations like yourfirm-partners.com or get-yourfirm.com), forward them back to your main site, and isolate all cold sending there.

DNS records are non-negotiable

Every sending domain needs SPF, DKIM and DMARC configured correctly. Missing or misconfigured records will route legitimate messages straight to spam at every major provider. DMARC should start at p=none for monitoring and tighten over time.

Warm-up is mandatory, not optional

A new sending domain has no reputation. Sending 50 messages per day to cold prospects on day one will burn it within a week. Use a warm-up service for at least 14 days, ramping volume gradually. Real cold sending should not start until the warm-up tool reports inbox placement above 90 percent.

• Days 1 to 7: warm-up traffic only, 10 to 20 sends per day.
• Days 8 to 14: warm-up plus a small live cohort of 10 sends per day.
• Days 15 to 30: ramp to 30 to 40 live sends per day, keep warm-up running in background.
• Day 30 onwards: stable cap of 40 live sends per day per inbox.

List quality drives placement more than copy

A bounced email damages reputation. A spam-trap hit can destroy a domain. Verify every list with a quality verifier (Million Verifier, NeverBounce or similar) and remove anything marked risky or unknown. The cost of verification is trivial compared to the cost of a burned domain.

Monitor inbox placement, not just open rates

Open rates are unreliable since Apple Mail Privacy Protection. Use seed-based inbox placement testing (GlockApps or equivalent) at least weekly to know where your messages are actually landing. A campaign with 60 percent opens and 40 percent spam placement is a campaign that is failing.

Reputation compounds, both ways

A well-managed sending domain becomes more valuable over time as its reputation matures. A poorly managed one becomes worthless quickly and is rarely recoverable. Treat the infrastructure with the same care as the messaging. Once deliverability is solid, the next leverage point is usually targeting: see our ICP framework for tech consultancies and our notes on measuring outbound ROI. The two are inseparable.